unity3d脚本之鸡零狗碎

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这里记录的是unity3d开发中用到的鸡零狗碎的代码片段。

1、键盘方向键移动对象

public class KeyboardMove : MonoBehaviour{private float speed = 5f;void FixedUpdate (){if (Input.GetAxis ("Horizontal") != 0 || Input.GetAxis ("Vertical") != 0) {Vector2 movement = new Vector2 (Input.GetAxis ("Horizontal"), Input.GetAxis ("Vertical"));transform.Translate (movement * speed * Time.deltaTime);}}}

2、2d绑定对象的大小

gameObject.GetComponent<SpriteRenderer>().sprite.bounds.size.x;gameObject.GetComponent<SpriteRenderer>().sprite.bounds.size.y;

3、从屏幕下方消失的时候，销毁对象

public class DestroyInvisible : MonoBehaviour {void OnBecameInvisible (){if (Camera.main != null) {if (transform.position.y < Camera.main.ScreenToWorldPoint (new Vector3 (0f, 0f, 0f)).y) {Destroy (gameObject);}} else {Debug.Log("Camera.main is null.");}}}

4、2D滚动视差背景

从老外那抄的，原理我说不清楚，这个是纵轴，也就是Y轴滚动

using UnityEngine;using System.Collections;public class parallaxY : MonoBehaviour {public Transform[] backgrounds;private float[] parallaxScales;public float smoothing = 1f;private Transform cam;private Vector3 previousCamPos;void Awake (){cam = Camera.main.transform;}void Start (){previousCamPos = cam.position;parallaxScales = new float[backgrounds.Length];for (int i=0; i<backgrounds.Length; i++) {parallaxScales [i] = backgrounds [i].position.z * -1;}}void Update (){for (int i=0; i<backgrounds.Length; i++) {float parallax=(previousCamPos.y -cam.position.y)*parallaxScales[i];float backgroundTargetPosY=backgrounds[i].position.y+parallax;Vector3 backgroundTargetPos = new Vector3(backgrounds[i].position.x,backgroundTargetPosY,backgrounds[i].position.z);backgrounds[i].position=Vector3.Lerp(backgrounds[i].position,backgroundTargetPos,smoothing*Time.deltaTime);}previousCamPos = cam.position;}}

背景作为数组，对象的position.Z影响移动速度

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